A violation of a statute, regulation or ordinance, which may be criminal or merely not in conformity; that which lacks authority of or support from the law.

A union of two people not formalised in the customary manner as prescribed by law but created by an informal agreement to marry followed by cohabitation. As the union is not legally recognised it does not affect or grant any rights of property ownership, rights of survivorship or spousal benefits as between the parties.

A marriage arranged or entered into for a (non-romantic) financial, practical or political purpose that benefits one or both spouses, such as to gain nationality; a financial, practical or political arrangement between two people, groups or political parties that would not normally be expected to work together.